|Numéro de publication||US7479346 B1|
|Type de publication||Octroi|
|Numéro de demande||US 11/201,987|
|Date de publication||20 janv. 2009|
|Date de dépôt||10 août 2005|
|Date de priorité||13 août 2004|
|État de paiement des frais||Payé|
|Numéro de publication||11201987, 201987, US 7479346 B1, US 7479346B1, US-B1-7479346, US7479346 B1, US7479346B1|
|Inventeurs||Lu Chow, Paul Berg, Alexandru Z. Pal|
|Cessionnaire d'origine||Quallion Llc|
|Exporter la citation||BiBTeX, EndNote, RefMan|
|Citations de brevets (43), Référencé par (27), Classifications (22), Événements juridiques (4)|
|Liens externes: USPTO, Cession USPTO, Espacenet|
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/601,285; filed on Aug. 13, 2004; entitled “Battery Pack;” and incorporated herein in its entirety.
The present invention relates to electrochemical devices and more particularly to battery packs.
Electrical power sources have been developed for powering movement of vehicles such as cars. Because these vehicles have large power requirements, these power sources typically include several large batteries. However, difficulties associated with managing the thermal characteristics of large batteries can make these batteries impractical for use in powering vehicles.
An alternative to the use of large batteries is a battery pack that includes a collection of smaller individual batteries. One version of prior power packs connects several battery trains in series where each battery train includes a plurality of batteries in series. Because the batteries in a series discharge differently, it is often desirable to monitor each battery in the series to prevent damage to the batteries. For instance, secondary batteries can often be damaged by dropping below a particular voltage level on discharge or by being charged above a particular voltage level during charging. As a result, each of the batteries in the battery pack can be monitored to prevent any one of the batteries from falling below a certain voltage on discharge or rising above a certain voltage upon charging. The battery monitoring requirements increase as the number of batteries in the battery pack increases. These extensive monitoring characteristics are undesirable and can be impractical for battery packs having large numbers of individual batteries.
An alternate battery pack connects battery groups in series where each of the batteries in a battery group is connected in parallel. As a result, these battery packs require several parallel connections. Each parallel connection must carry the current provided by the battery pack. As the current level to be provided by the battery pack increases, the size of these parallel connections must be increased. The current requirements needed to power a vehicle cause these parallel connections to be undesirably large and heavy. The large size of these parallel connections makes these battery packs impractically large and heavy for use in powering vehicles.
For the above reasons there is a need for a battery pack that is suitable for use in powering vehicles.
A battery pack is disclosed. The battery pack includes bus lines connecting a plurality of source trains in parallel. Each source train includes a plurality of voltage sources connected in series. Each voltage source includes one or more batteries. The battery pack also includes one or more balance lines providing electrical communication between the source trains such that a voltage source in one of the source trains is connected in parallel with a voltage source in one or more of the other source trains. In some instances, the balance lines provide electrical communication between the source trains such that each voltage source in each of the source trains is connected in parallel with a voltage source in each of the other source trains.
In some instances, one or more of the voltage source includes a plurality of batteries connected in parallel and/or one or more of the voltage source includes a plurality of batteries connected in series. In a preferred embodiment, each of the voltage sources included in a source train consists of a single battery.
In one embodiment of the battery pack, series lines connect each voltage source in a source train in series with another voltage source in the same source train. The balance lines each include one or more cross lines that provide electrical communication between different series lines. In some instances, the battery pack includes a balance connector connected to a portion of the batteries so as to serve as a balance line and as series lines. The balance connector can have a one-piece construction. For instance, the balance connector can be stamped from a sheet of metal. In some instances, the balance connector includes a plurality of tabs extending from a common region, each of the tabs prove electrical communication between a battery and the common region. The balance connector can optionally include one or more holes extending through the balance connector to permit liquid flow though the balance connector. The holes can be positioned over a gap between batteries adjacent to one another so as to permit liquid flow through the holes into the gap. In some instances, the balance connector is arched along a lateral axis.
The batteries employed in the battery pack can each include features that prevent a battery from acting as a short in the event that the battery fails. Examples of these features include, but are not limited to, shut down separators, current interruption devices and burst discs.
A power supply system is also disclosed. The power supply system includes a battery pack and a processing unit configured to monitor a voltage differential between at least two of the balance lines and/or between at least one balance line and a bus line. Vehicles that employ the battery pack and/or power supply system are also disclosed. Additionally, methods of preparing the battery pack and the power supply system are also disclosed.
The battery pack includes a plurality of source trains connected in parallel by bus lines. Each source train includes a plurality of voltage sources connected in series. Each voltage source includes one or more batteries. In a preferred embodiment, each voltage source consists of a single battery. The battery pack also includes one or more balance lines. Each balance line provides electrical communication between the source trains such that a voltage source in one of the source trains is connected in parallel with a voltage source in the other source trains. For instance, a source train can include one or more series lines that each connect two batteries in series. A balance line can provide electrical communication between the series lines in two or more source trains.
In some instances, the battery trains and balance lines are arranged such that each voltage source is connected in parallel with a voltage source in each of the other source trains. Accordingly, when each voltage source consists of a single battery, each battery in a source train is connected in parallel with a single battery from each of the other source trains.
During discharge of the battery pack, current can flow from a battery through a balance line or through a series line. However, the series lines carry the primary current flow while the balance lines allow the power level to be balanced out between the batteries connected in parallel. Because this balancing does not require large amounts of current to pass through the balance lines, the balance lines need not be as large or as heavy as prior parallel connections. Accordingly, the balance lines allow the size and weight of the battery pack to be reduced relative to the size and weight of battery packs that connect battery groups in parallel.
During use of the battery pack, each of the batteries connected in parallel is maintained at the same voltage. As a result, the voltage of each battery connected in parallel by two balance lines can be concurrently monitored by monitoring the two balance lines. Further, the voltage of each battery connected in parallel by a balance line and a bus line can be concurrently monitored by monitoring the balance line and the bus line. As a result, this arrangement reduces the need to monitor each of the batteries in the battery pack.
The batteries employed in the battery pack can each include features that prevent a battery from acting as a short in the event battery failure. Examples of these features include, but are not limited to, shut down separators, current interruption devices and burst discs. These features allow one or more batteries in the battery pack to fail without causing failure of the battery pack. As a result, the battery pack can provide safety and performance characteristics to a vehicle that are not available when large batteries are employed.
The battery pack also includes a plurality of balance lines 22. The balance lines 22 each include one or more cross lines 24 that provide electrical communication between series lines 18 in different source trains 14. Accordingly, each balance line 22 provides a parallel connection between the voltage sources 16 in different source train 14. For instance, each balance line 22 provides electrical communication between different source trains 14 such that a voltage source 16 in one of the source trains 14 is connected in parallel with a voltage source 16 in the other source trains 14. Because a single balance line 22 only provides one of the parallel connections, another connection is needed to connect voltage sources 16 in parallel. The other parallel connection can be provided by another balance line 22 or by a bus line 12.
Each of the voltage sources 16 includes one or more batteries. In some instances, one or more of the voltage source 16 includes a plurality of batteries connected in parallel and/or one or more of the voltage source 16 includes a plurality of batteries connected in series. However, the voltage monitoring requirements of the power pack may increase as the number of series connected batteries in a voltage source 16 increases. Each of the voltage sources 16 included in the source trains 14 can be the same or different. In a preferred embodiment, each of the voltage sources 16 is the same. In a preferred embodiment, each of the voltage sources 16 consists of a single battery.
A voltage source 16 can include electrical components in addition to batteries. For instance, a voltage source 16 can include one or more resistors and one or more capacitors in addition to the one or more batteries. In a preferred embodiment, each of the voltage sources 16 consists of one or more batteries and the associated electrical connections.
Each of the voltage sources 16 connected in parallel belongs to a parallel group 28. Accordingly, the battery pack of
The power pack illustrated in
The battery packs can be configured to provide more than 9 V or more than 12 V. Additionally or alternately, the battery packs can be configured to provide more than 50 watt-hours, more than 100 watt-hours or more than 240 watt-hours. Many of the issues resolved by the battery pack, such as the size and weight of multiple parallel connections, do not become relevant until the battery pack is used with a large number of batteries and/or for applications requiring high power levels. As a result, the battery pack is suitable for high power applications such as powering the movement of vehicles such as trucks, cars and carts. For these high power applications, the battery pack is preferably configured to provide more than 18 V, more than 24 V or more than 32 V. Additionally or alternately, the battery pack is preferably configured to provide more than 240 watt-hours, more than 500 watt-hours or more than 1000 watt-hours. In some instances, the above performance levels are achieved using a battery pack where the batteries in the source trains 14 each have a voltage of less than 14 V, 10 V or 5 V.
Although not illustrated in
During operation of the power supply system, the processing unit can monitor the voltage of the batteries in each parallel group and control the performance of the battery pack based on the results of this monitoring. For instance, secondary batteries can often be damaged by dropping below a particular voltage level on discharge or by being increased above a particular voltage level during charge. Accordingly, the processing unit can stop discharge of the battery pack in the event that the voltage of one or more of the parallel groups falls below a lower threshold voltage. Additionally or alternately, the processing unit can stop discharge of the battery pack in the event that the voltage of one or more of the parallel groups rises above an upper threshold voltage.
Suitable processing units can include, but are not limited to, an analog electrical circuits, digital electrical circuits, processors, microprocessors, digital signal processors (DSPs), computers, microcomputers, or combinations suitable for performing the required control and calculation functions. In some instances, the processing unit has access to a memory that includes instructions to be executed by the processing unit during performance of the control and monitoring functions.
The battery pack further includes a plurality of balance connectors 38. Each balance connector 38 includes tab regions 40 extending from a common region 42. The tab regions 40 are each in electrical communication with a terminal of a battery and serve as a series line 18 while the common regions 42 each serves as a balance line. The battery pack includes balance connectors 38 on the bottom of the battery pack. These balance connectors 38 provide the electrical connections between the terminals on the opposite ends of the batteries. Electrical communication can be achieved between a tab region 40 and a battery by attaching the tab region 40 to a terminal of the battery. Suitable methods for attaching a tab 34 or a tab region 40 to a battery include, but are not limited to, welding.
As noted above, lower current levels are conducted through the balance lines than are conducted through the bus lines. As a result, the bus connectors 32 have larger cross sectional areas than the balance connectors 38. A suitable method of constructing the bus connector 32 includes connecting the tabs 34 to a metal bar. Suitable materials for the bar include, but are not limited to, copper, nickel or other highly conductive materials. The bar should be large enough to successfully carry the current levels that will be provided by the battery pack. Suitable materials for the tabs 34 include, but are not limited to, highly conductive materials such as nickel. Nickel can offer the advantage of high corrosion resistance.
The battery pack can include a case 48 as illustrated in
In some instances, a liquid is positioned in the case along with the batteries. The case can include one or more inlets (not shown) and one or more outlets (not shown) through which the liquid can be circulated through the case from an outside source. Alternately, the liquid can be limited to the interior of the case. In some instances, the liquid is a cooling liquid for regulation to regulate the temperature of the battery pack on charge and/or on discharge. The balance connector 38 can include one or more holes 56 extending through the common region 42 as is best illustrated in
In some instances, the process unit disclosed in the context of
The batteries can include one or more safety features to ensure that current flow through the battery is reduced or stopped in the event of battery stress or failure. As a result, these safety features can reduce the opportunity for a short in the battery pack. An example of a suitable safety feature is a shut-down separator. A battery generally includes an electrolyte activating one or more cathodes and one or more anodes. A separator is positioned between the anode(s) and cathode(s) in a battery and permits migration of ions through the separator. A shut-down separator is selected to prevent or reduce passage of ions through the separator once the temperature in the battery rises above a threshold temperature. As a result, a shut-down operator can cease operation of the battery once the temperature in the battery exceeds the temperature threshold.
An example shut-down separator includes openings such as pores, perforations or apertures through which the ions pass during discharge of the battery. The shut-down separator material can be selected such that the passage of the ions through the pores or openings is reduced or stopped once the threshold temperature is exceeded. For instance, the shut-down separator can be constructed from a material that begins to flow at the threshold temperature. The flow can completely or partially seal the openings in the separator and can accordingly reduce or prevent flow of ions through the openings. Examples of materials suitable for use as shut-down separators include, but are not limited to, polyolefin's such polyethylene, polypropylene and combinations thereof.
The batteries can also include a current interruption device. An example current interruption device interrupts current flow from a battery once the pressure in the battery exceeds a threshold pressure.
The battery also includes a tab 62, an electrically conducting diaphragm 64 and a cap 66 that serves as a terminal for the battery. During operation of the battery, the conducting member is in contact with the tab 62 as illustrated in
The batteries can also include a burst disc. A burst disc is a member of the battery casing that includes one or more regions of weakness. The one or more regions of weakness cause the disc to rupture at a pressure below the pressure at which the disc would rupture without the region(s) of weakness. Accordingly, the member having the regions of weakness ruptures before the battery would rupture without use of the burst disc. The early disruption prevents the pressure in the battery from reaching dangerous levels. The regions of weakness can be defined by holes, perforations or openings.
A battery can include both a burst disc and a current interruption device.
All or a portion of the batteries in the battery pack can include one or more of the above features. For instance, each battery included in a source train can include one or two safety features selected from a group consisting of, a shut-down separator, a current interruption device and a burst disc. In a preferred embodiment, each of the batteries in each of the source trains includes a shut-down separator, a current interruption device and a burst disc.
The battery pack can be employed to power movement of a vehicle. Examples of suitable vehicles are vehicles configured to hold and transport living people such as cars, truck and golf-carts. In some instances, the vehicles are for transporting people on land.
The batteries employed in the source trains can be primary or secondary batteries. When the battery pack is employed to power movement of a vehicle, the batteries are preferably secondary batteries to allow re-charging of the batteries after use of the vehicle. In some instances, the batteries are lithium ion secondary batteries. However, commercially available lithium ion batteries include a PTC device (positive temperature coefficient device). These PTC devices can break down at high voltages. As a result, commercially available lithium ion batteries are generally limited to battery packs that include source trains that individually provide fewer than 32 V, i.e. source trains with fewer than eight 4 V voltage sources. However, the battery pack is often used with higher voltage applications. Accordingly, the battery pack often includes source trains having more than 8 voltage sources. In some instances, the battery pack often includes source trains having more than eight 4V voltage sources. In these instances, the battery pack can employ batteries that exclude PTC devices.
Other embodiments, combinations and modifications of this invention will occur readily to those of ordinary skill in the art in view of these teachings. Therefore, this invention is to be limited only by the following claims, which include all such embodiments and modifications when viewed in conjunction with the above specification and accompanying drawings.
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|Classification aux États-Unis||429/158, 320/112|
|Classification coopérative||H01M10/625, H01M10/613, H01M10/643, H01M10/6567, H01M2/206, H01M10/48, H01M2/1235, H01M10/4235, H01M2/1083, H01M2/22|
|Classification européenne||H01M10/50K12D, H01M10/50C2, H01M10/50H2, H01M10/50D4, H01M10/48, H01M10/42M, H01M2/10C4C, H01M2/22, H01M2/20D4|
|9 nov. 2005||AS||Assignment|
Owner name: QUALLION LLC, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BERG, PAUL;PAL, ALEXANDRU Z.;REEL/FRAME:016990/0646;SIGNING DATES FROM 20050811 TO 20050829
|1 août 2012||SULP||Surcharge for late payment|
|1 août 2012||FPAY||Fee payment|
Year of fee payment: 4
|7 juil. 2016||FPAY||Fee payment|
Year of fee payment: 8